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A binder component for high-strength metal injection molding and its preparation method

An injection molding, high-strength technology, used in adhesives, etc.

Active Publication Date: 2018-05-11
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (LDPE-g-GMA) and ethylene vinyl acetate copolymer grafted maleic anhydride (EVA-g-MAH), containing low density polyethylene, ethylene vinyl acetate copolymer, carboxyl, hydroxyl, ester groups and other structures, It can effectively improve the wettability and feeding fluidity between the binder and the metal powder; the peel strength between the binder and the metal powder is relatively uniform; and the molecular structure contains a variety of different structures, and its decomposition temperature Different, it can provide properties such as fluidity and shape retention in different temperature ranges; thereby generally improving the strength of the green body and the compactness of the final product. The binder containing this component can well solve the degreasing process Various defects such as cavities, bubbling, cracking, collapse, deformation, etc., further effectively improve the quality of the green body and products

Method used

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  • A binder component for high-strength metal injection molding and its preparation method
  • A binder component for high-strength metal injection molding and its preparation method
  • A binder component for high-strength metal injection molding and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Reaction raw materials and mass percent are respectively: LDPE-g-GMA 50% (grafting rate 1.5%), EVA-g-MAH50% (grafting rate 1.5%) and aluminum acetylacetonate (1% of the total mass of reaction raw materials ). The raw materials are put into a high-speed mixer, mixed evenly, and then melted and extruded through an extruder, the extrusion temperature is 220°C, and the main screw speed is 200r / min. The components and mass percentage of the binder are: 8% reactant of LDPE-g-GMA and EVA-g-MAH, 5% low-density polyethylene LDPE, 4% ethylene acetate EVA, 48% paraffin, 5% stearic acid , POM 30%. Add each component into a high-speed mixer, mix evenly, and then melt and extrude through an extruder (the extrusion temperature is 180°C, the main screw speed is 180r / min) and make it into pellets. The obtained granules are binders, which are uniformly mixed with metal powders in an internal mixer (the mass percentages of binders and metal powders are 7% and 93% respectively) to obtain...

Embodiment 2

[0027] The reaction raw materials and mass percentages are respectively: LDPE-g-GMA60% (grafting ratio 2%), EVA-g-MAH 40% (grafting ratio 2%) and 1,2-dimethylimidazole (reaction raw material 1% of the total mass). The raw materials are put into a high-speed mixer, mixed evenly, and then melted and extruded through an extruder, the extrusion temperature is 220°C, and the main screw speed is 200r / min. The components and mass percentage of the binder are: 8% reactant of LDPE-g-GMA and EVA-g-MAH, 5% LDPE, 4% EVA, 48% paraffin, 5% stearic acid, 30% polyoxymethylene . Add each component into a high-speed mixer, mix evenly, and then melt and extrude through an extruder (the extrusion temperature is 180°C, the main screw speed is 180r / min) and make it into pellets. The obtained granules are binders, which are uniformly mixed with metal powders in an internal mixer (the mass percentages of binders and metal powders are 7% and 93% respectively) to obtain feed materials, which are then...

Embodiment 3

[0030] The mass percentages of the raw materials are: LDPE-g-GMA 50% (grafting rate 2%), EVA-g-MAH 50% (grafting rate 2%) and aluminum acetylacetonate (1.5% of the total mass of the reaction raw materials). The raw materials are put into a high-speed mixer, mixed evenly, and then melted and extruded through an extruder, the extrusion temperature is 220°C, and the main screw speed is 200r / min. The components and mass percentages of the binder are: 10% of the reactant of LDPE-g-GMA and EVA-g-MAH, 4% of LDPE, 3% of EVA, 48% of paraffin, 10% of stearic acid, 25% of polyoxymethylene %. Add each component into a high-speed mixer, mix evenly, and then melt and extrude through an extruder (the extrusion temperature is 180°C, the main screw speed is 180r / min) and make it into pellets. The obtained granules are binders, which are uniformly mixed with metal powders in an internal mixer (the mass percentages of binders and metal powders are 7% and 93% respectively) to obtain feed materia...

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Abstract

The invention provides an adhesive component used for high-strength metal injection molding and a preparation method thereof.The adhesive component is obtained by reacting LDPE-g-GMA with EVA-g-MAH, the adhesive component contains low-density polyethylene, ethylene-ethylic acid ethylene copolymer, carboxyl, hydroxyl, ester groups and other structures, and wettability and feeding flowability between an adhesive and metal powder can be effectively improved.Peel strength between the adhesive and the metal powder is uniform.A molecular structure contains various different structures, decomposition temperatures are different, and flowability, conformality and other performance can be provided in different temperature ranges.Accordingly, strength of blank and compactness of final products are improved as a whole, the adhesive containing the component can well overcome various defects of cavitation, bubbling, cracking, collapse, deformation and the like in the degreasing process, and the quality of the blank and the products is further effectively improved.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a binder component for high-strength metal injection molding and a preparation method. Background technique [0002] Powder injection molding (PIM) is a new forming technology developed in recent decades. It has the advantages of one-time forming of complex shape products, high dimensional accuracy of products, no need for mechanical processing or only minimal processing, and low preparation cost. It can form complex shapes, such as ceramic and metal special-shaped parts with horizontal holes, inclined holes, concave-convex surfaces, threads, thin walls, and difficult to machine, and has a wide range of application prospects. In the production process of powder injection molding, in order to make the powder have good fluidity to fill the complex cavity and prepare products with uniform structure and excellent performance, a certain mass ratio (5-10%) of binder must be a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J187/00C08G81/02B22F3/22
CPCB22F3/225C08G81/021C09J187/005
Inventor 徐卫兵朱海洋宋善寒周正发马海红任凤梅
Owner HEFEI UNIV OF TECH
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